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Table 3 Representative FTIR spectra (cm−1) of dihydrocaffeic acid ester

From: Optimization of enzymatic esterification of dihydrocaffeic acid with hexanol in ionic liquid using response surface methodology

Frequency range (cm−1)

Frequency (cm−1)

Functional groups

DHCAa

Hexyl dihydrocaffeate

3500–3200

3338

 

3502b, 3386

O–H stretching

3000–2850

2925–2869

 

2917–2856

C–H stretching

1760–1690

1668

 

1705

C=O stretching

1600–1400

1525–1441

 

1608–1534

C=C stretching

1320–1000

1207–1286

 

1192–1261

C–O stretching

700 ± 20

728

Long chain (C–H)

  1. aDihydrocaffeic acid
  2. bH-bond lattice